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    Wireless networks utilizing multiple modulations
    3.
    发明授权
    Wireless networks utilizing multiple modulations 有权

    公开(公告)号：US09900193B2

    公开(公告)日：2018-02-20

    申请号：US13566639

    申请日：2012-08-03

    申请人： Timothy Mark Schmidl ,  Srinath Hosur ,  Anuj Batra

    发明人： Timothy Mark Schmidl ,  Srinath Hosur ,  Anuj Batra

    IPC分类号： H04L27/00 ,  H04L27/26

    CPC分类号： H04L27/0012 ,  H04L27/2613

    摘要： A method of communicating in a wireless network including a plurality of nodes having communications devices including a first node, wherein at least one node utilizes a first physical layer (PHY) modulation, and at least one other node utilizes a second PHY modulation different from the first PHY modulation. The first node receives a PHY frame transmitted by one of the plurality of nodes, and identifies a PHY modulation type selected from the first PHY modulation and the second PHY modulation used in the PHY frame or to be used in a subsequently to be received PHY frame or frame portion. The first node decodes the PHY frame or the subsequently to be received PHY frame or frame portion using the PHY modulation type identified in the identifying step.

    Noise variance estimation
    4.
    发明授权
    Noise variance estimation 有权
    噪声方差估计

    公开(公告)号：US08054914B2

    公开(公告)日：2011-11-08

    申请号：US12022461

    申请日：2008-01-30

    申请人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

    发明人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

    IPC分类号： H03K9/00 ,  H04L27/00

    CPC分类号： H04L27/2647 ,  H04L1/206

    摘要： A method and system for estimating noise variance. A method for noise variance estimation comprises receiving a first multi-sample symbol and receiving a second multi-sample symbol. The first multi-sample symbol is subtracted from the second multi-sample symbol to produce a set of noise samples. The set of noise samples is used to produce a noise variance estimate. The noise variance estimate is applied in various tasks (e.g. channel estimation, log-likelihood ratio computation, and/or minimum mean squared error equalization) to process data provided to a user.

    摘要翻译： 一种用于估计噪声方差的方法和系统。 一种用于噪声方差估计的方法包括接收第一多样本符号并接收第二多样本符号。 从第二多样本符号中减去第一多样本符号以产生一组噪声样本。 噪声样本集用于产生噪声方差估计。 在各种任务（例如信道估计，对数似然比计算和/或最小均方误差均衡）中应用噪声方差估计以处理提供给用户的数据。

    Robust detection of packet types
    5.
    发明授权
    Robust detection of packet types 有权
    分组类型的鲁棒检测

    公开(公告)号：US07957474B2

    公开(公告)日：2011-06-07

    申请号：US11618432

    申请日：2006-12-29

    申请人： Deric Wayne Waters ,  Srinath Hosur ,  Anuj Batra

    发明人： Deric Wayne Waters ,  Srinath Hosur ,  Anuj Batra

    IPC分类号： H04K1/10

    CPC分类号： H04L27/0012 ,  H04L27/22 ,  H04L27/2647

    摘要： Disclosed herein is a system and method for determining the presence of rotated-BPSK modulation. In addition, disclosed herein is a system and method for determining if a received packet is a Legacy, Mixed-Mode, or Green-Field packet in accordance with the determination of the presence of rotated-BPSK modulation. The presence of a Green-Field packet may be determined by detecting if additional tones are being excited in an LTF symbol of the received packet and/or if a SIG field symbol following the LTF symbol is modulated by rotated-BPSK. The presence of a Mixed-Mode packet may be determined by detecting if the first four bits of the SIG field symbol following the LTF symbol are [1 1 0 1] and/or detecting if a symbol following an L-SIG symbol is modulated by rotated-BPSK. The presence of a Legacy packet may be determined by detecting if the symbol following the L-SIG symbol is modulated by BPSK.

    摘要翻译： 本文公开了一种用于确定旋转BPSK调制的存在的系统和方法。 此外，本文所公开的是根据确定旋转BPSK调制的确定来确定接收的分组是传统的，混合模式的还是绿色场分组的系统和方法。 可以通过检测在接收到的分组的LTF符号中是否激励附加音调和/或如果通过旋转BPSK调制LTF符号之后的SIG字段符号，则可以确定绿场分组的存在。 混合模式分组的存在可以通过检测LTF符号之后的SIG字段符号的前四位是否为[1×10 1]和/或检测在L-SIG符号之后的符号是否被 旋转BPSK。 可以通过检测L-SIG符号之后的符号是否被BPSK调制来确定遗留分组的存在。

    Time-switched preamble generator, method of generating and multiple-input, multiple-output communication system employing the generator and method
    6.
    发明授权
    Time-switched preamble generator, method of generating and multiple-input, multiple-output communication system employing the generator and method 有权
    时间切换前导码生成器，生成和多输入方法，采用发生器和方法的多输出通信系统

    公开(公告)号：US07864661B2

    公开(公告)日：2011-01-04

    申请号：US10755603

    申请日：2004-01-12

    申请人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  David P. Magee

    发明人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  David P. Magee

    IPC分类号： H04J11/00

    CPC分类号： H04W88/08

    摘要： The present invention is directed to a time-switched preamble generator and method of generating a time-switched preamble for use with a multiple-input, multiple-output (MIMO) transmitter employing first and second transmit antennas. In one embodiment, the time-switched preamble generator includes an initial preamble formatter configured to provide a first preamble to the first transmit antenna and a second preamble to the second transmit antenna during an initial time interval. The time-switched preamble generator also includes a subsequent preamble formatter coupled to the initial preamble formatter and configured to provide the second preamble to the first transmit antenna and the first preamble to the second transmit antenna during a subsequent time interval.

    摘要翻译： 本发明涉及一种时间切换前导码生成器和用于与采用第一和第二发射天线的多输入多输出（MIMO）发射机一起使用的时间切换前同步码的方法。 在一个实施例中，时间切换前导码生成器包括初始前同步码格式器，其被配置为在初始时间间隔期间向第一发射天线提供第一前同步码和第二前导码到第二发射天线。 时间切换前导码生成器还包括后续前导码格式器，其耦合到初始前导码格式化器并且被配置为在随后的时间间隔期间向第一发射天线提供第二前同步码和第一前导码到第二发射天线。

    Hybrid-ARQ (HARQ) with Scrambler and Diversity
    7.
    发明申请
    Hybrid-ARQ (HARQ) with Scrambler and Diversity 有权
    混合ARQ（HARQ）与扰码器和多样性

    公开(公告)号：US20100180173A1

    公开(公告)日：2010-07-15

    申请号：US12686929

    申请日：2010-01-13

    申请人： Anuj Batra ,  Deric W. Waters ,  Srinath Hosur

    发明人： Anuj Batra ,  Deric W. Waters ,  Srinath Hosur

    IPC分类号： H04L1/18 ,  H03M13/05 ,  G06F11/10 ,  G06F11/14

    CPC分类号： H04L1/1812 ,  H04L1/188 ,  H04L1/1893

    摘要： Embodiments of the invention provide a system and method of hybrid automatic repeat-request (HARQ) processing. A viterbi decoder is coupled to and follows a descrambler. After the signal has been de-scrambled, it can be stored in a memory in case it needs to be recombined with another packet. This means that the log-likelihood ratios LLRs for each transmitted bit are stored in memory using a finite number of bits (for example, between 4 and 12 bits). If the packet that is currently being processed contains retransmitted information, then the de-scrambled output stored from a previous packet containing the same information can be loaded and combined with the current packet.

    摘要翻译： 本发明的实施例提供了一种混合自动重传请求（HARQ）处理的系统和方法。 维特比解码器耦合到并跟随解扰器。 在信号被解除加扰之后，如果需要与另一个数据包重新组合，则可将其存储在存储器中。 这意味着每个发送的比特的对数似然比LLRs使用有限数量的比特（例如，在4比特和12比特之间）存储在存储器中。 如果当前处理的分组包含重发信息，则可以将包含相同信息的先前分组存储的去加扰输出加载并与当前分组组合。

    Scaling to reduce wireless signal detection complexity
    8.
    发明授权
    Scaling to reduce wireless signal detection complexity 有权
    缩小无线信号检测复杂度

    公开(公告)号：US08699554B2

    公开(公告)日：2014-04-15

    申请号：US11928050

    申请日：2007-10-30

    申请人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

    发明人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

    IPC分类号： H03H7/30 ,  H03K5/159

    CPC分类号： H04L25/03006 ,  H04L2025/03426 ,  H04L2025/03605

    摘要： In at least some embodiments, a receiver for a wireless communication system is provided. The receiver includes an equalizer that provides an equalized channel matrix. The receiver also includes scaling logic coupled to the equalizer, the scaling logic selectively scales coefficients of the equalized channel matrix. The receiver also includes a decoder coupled to the scaling logic. The decoder decodes a signal based on the equalized channel matrix with scaled coefficients.

    摘要翻译： 在至少一些实施例中，提供了一种用于无线通信系统的接收机。 接收机包括提供均衡信道矩阵的均衡器。 接收机还包括耦合到均衡器的缩放逻辑，缩放逻辑选择性地缩放均衡信道矩阵的系数。 接收机还包括耦合到缩放逻辑的解码器。 解码器基于具有缩放系数的均衡信道矩阵来解码信号。

    Packet detection and coarse symbol timing for rotated differential M-ary PSK modulated preamble signal
    9.
    发明授权
    Packet detection and coarse symbol timing for rotated differential M-ary PSK modulated preamble signal 有权
    分组检测和用于旋转差分M-ary PSK调制前同步码信号的粗符号定时

    公开(公告)号：US08630374B2

    公开(公告)日：2014-01-14

    申请号：US12881924

    申请日：2010-09-14

    申请人： June Chul Roh ,  Anuj Batra ,  Srinath Hosur

    发明人： June Chul Roh ,  Anuj Batra ,  Srinath Hosur

    IPC分类号： H03D3/22

    CPC分类号： H04L27/227 ,  H04L7/042 ,  H04L7/10 ,  H04L27/2071 ,  H04L27/2078 ,  H04L2027/0038 ,  H04L2027/0095

    摘要： A packet detection and coarse symbol timing recovery system for preamble signal modulated with rotated differential M-ary phase shift key (PSK) modulation includes a differential detection unit, to provide a symbol signal responsive to a received signal. A preamble sequence correlator performs a preamble sequence correlation on the symbol signal to produce a correlator signal. A metric calculation unit performs a metric calculation on the correlator signal to produce a metric. A packet detection unit determines that a packet is detected and produces a sample index. A coarse symbol timing unit finds a peak of the calculated metric signal outputs a sample index for the peak as coarse symbol timing information. The sample indexes are used in processing a physical layer convergence procedure (PLCP) header and physical layer service data unit (PSDU) block.

    摘要翻译： 用于利用旋转的差分M相移键（PSK）调制调制的前同步信号的分组检测和粗略符号定时恢复系统包括差分检测单元，以响应于接收到的信号提供符号信号。 前序序列相关器在符号信号上执行前同步码序列相关，以产生相关器信号。 度量计算单元对相关器信号执行度量计算以产生度量。 分组检测单元确定检测到分组并产生样本索引。 粗略符号定时单元发现所计算的度量信号的峰值将峰值的采样索引作为粗略符号定时信息输出。 样本索引用于处理物理层收敛过程（PLCP）头和物理层服务数据单元（PSDU）块。